When CONFIG_GPIOLIB is disabled, we run into a build failure:

  drivers/pci/dwc/pcie-qcom.c: In function 'qcom_pcie_probe':
  drivers/pci/dwc/pcie-qcom.c:1223:16: error: implicit declaration of function 'devm_gpiod_get_optional'; did you mean 'devm_regulator_get_optional'? [-Werror=implicit-function-declaration]
    pcie->reset = devm_gpiod_get_optional(dev, "perst", GPIOD_OUT_LOW);

Including gpio/consumer.h directly is the correct fix.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: NBjorn Andersson <bjorn.andersson@linaro.org>